Dockerfile.erb

FROM node:<%= version %>

# Remove the outdated version of yarn that is installed by the node image
RUN rm -f /usr/local/bin/yarn

# Install yarn package manager
RUN echo "deb http://dl.yarnpkg.com/debian/ stable main" | tee /etc/apt/sources.list.d/yarn.list
RUN apt-key adv --keyserver pgp.mit.edu --recv D101F7899D41F3C3 \
  && apt-get update -qq && apt-get install -y -qq yarn \
  && apt-get clean && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/* /usr/share/doc/

# Install node-gyp
RUN npm install -g node-gyp

# Create a user called `app`
RUN useradd -ms /bin/bash app
# Switch to running as the user called app
WORKDIR /home/app

# Copy across package.json and yarn.lock and
# install depedencies.
# This is a separate step so it can be cached and the
# cache is used when not changing depedencies
ONBUILD COPY package.json yarn.lock /home/app/
ONBUILD RUN yarn install --pure-lockfile

ONBUILD COPY . /home/app
ONBUILD RUN chown -R app:app /home/app
ONBUILD USER app

CMD [ "yarn", "run", "start" ]